sanitize for eMMC v4.5

sanitize for eMMC v4.5

[ygardi]

sorry for sending it again...(changed the mailing-list)

hello,

i have a few questions regarding the sanitize capability that was added in
v4.5.

1. how often this operation should take place ?
   a. any advantages to perform sanitize in power-up, power-down, or every
X hours when the card in idle ?

2. how this operation should be triggered?
is it external adb command, or is part of the driver operation ?

3. does anyone have a speculated time duration for that operation
according to a card size / vendor ?

thanks,
Yaniv

Re: sanitize for eMMC v4.5

[Kyungmin Park]

Hi,

On 11/23/11, ygardi@codeaurora.org <ygardi@codeaurora.org> wrote:
> sorry for sending it again...(changed the mailing-list)
>
> hello,
>
> i have a few questions regarding the sanitize capability that was added in
> v4.5.
>
> 1. how often this operation should take place ?
>    a. any advantages to perform sanitize in power-up, power-down, or every
> X hours when the card in idle ?
It's not normally used at runtime. in our case, it's used at factory reset only
>
> 2. how this operation should be triggered?
> is it external adb command, or is part of the driver operation ?
it can trigger at block with BLKSECDISCARD
>
> 3. does anyone have a speculated time duration for that operation
> according to a card size / vendor ?
there's no timeout value at eMMC v4.5 spec. it takes long time depends
on chip status. the only way to stop is using HPI.
If you start the sanitize and there's user request then it call the
HPI. and it's not yet implemented at mmc code.

Thank you,
Kyungmin Park

>
> thanks,
> Yaniv
>
>
>
>
>
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